Sharp ER-A770 Manual page 38

2) Block diagram
DATA BUS
OPC1~USART
USART
Common input
3) Pin description
Pin
Name ER-A770
NO.
1 SL00 VCC
2 SL01 GND
3 SL02 GND
4 SL10 GND
5 SL11 GND
6 SL12 GND
7 SL20 GND
8 SL21 GND
9 SL22 GND
10 SL30 GND
11 SL31 GND
12 SL32 GND
13 /CD0 /DCD1
14 BRK0 BRK1
15 TRNEMP0 TRENMP1
16 RCVRDY0 RCVRDY1
17 TRNRDY0 TRNRDY1
18 /CTS0 /CTS1
19 RCVDT0 RCVDT1
20 VCC VCC
21 GND GND
22 /CI0 /CI1
23 /RTS0 /RTS1
BAUD RATE GENERATOR
USART USART
A B
I/O Description
ISU RS-232/UNIT0
channel select
ISU
ISU
ISU RS-232/UNIT1
channel select
ISU
ISU
ISU RS-232/UNIT2
channel select
ISU
ISU
ISU RS-232/UNIT3
channel select
ISU
ISU
RS-232 control
IS
signal /CD input
IS RS-232 break signal
RS-232 transmission
IS
buffer empty signal
RS-232 data
IS reception enable
signal
RS-232 transmission
IS
enable signal
RS-232 clear to send
IS
signal
RS-232 reception
IS
data signal
+5V
GND
RS-232 control
IS
signal /CI input
RS-232 request to
O
send signal
OPC2
OPC1
BAUD RATE GENERATOR
USART USART
C D
Pin
Name ER-A770
NO.
24 /CS0 /CS1
25 /CD1 /DCD2
26 BRK1 BRK2
27 TRNEMP1 TRENMP2
28 RCVRDY1 RCVRDY2
29 TRNRDY1 TRNRDY2
30 /CTS1 /CTS2
31 RCVDT1 RCVDT2
32 /CI1 /CI2
33 /RTS1 /RTS2
34 /CS1 /CS2
35 /CD2 VCC
36 TRNEMP2 TRENMP3
37 RCVRDY2 RCVRDY3
38 TRNRDY2 TRNRDY3
39 CTS2Z /CTS3
40 RCVDT2 RCVDT3
41 /CI2 VCC
42 /CS2 /CS3
43 /CD3 /SINT
44 BRK3 GND
45 TRNEMP3 GND
46 RCVRDY3 GND
47 TRNRDY3 GND
I/O Description
RS-232 chip select
O
signal
RS-232 control
IS
signal /CD input
IS GND
IS GND
IS GND
IS GND
IS +5V
RS-232 reception
IS
data signal
RS-232 control
IS
signal /CI input
RS-232 request to
O
send signal
RS-232 chip select
O
signal
IS +5V
IS GND
IS GND
IS GND
IS +5V
IS GND
IS +5V
O NU
RS-232: /CD,
IS
IN-LINE : /P1
IS GND
IS GND
IS GND
IS GND